package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    // 新增菜品
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        // 向菜品表插入一条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);

        // 获取到主键值
        Long dishId = dish.getId();

        // 向口味表插入多条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            // 向口味表插入 n 条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    // 菜品分页查询
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Transactional
    public void deleteBatch(List<Long> ids) {
        // 菜品能否删除 --- 菜品是否处于在售阶段
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)) {
                // 表示菜品待售状态不可删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 菜品能否删除 --- 菜品是否关联于套餐
        List<Long> setmealIdsByDishIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIdsByDishIds != null && !setmealIdsByDishIds.isEmpty()) {
            // 当前菜品被套餐关联了
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

//        // 删除菜品信息
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            // 删除菜品关联口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        // 删除数据的优化
        // 批量删除菜品信息数据
        dishMapper.deleteByIds(ids);

        // 批量删除菜品口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    // 根据 id 查询菜品
    public DishVO getByIdWithFlavor(Long id) {
        // 根据 id 查询菜品数据
        Dish dish = dishMapper.getById(id);
        // 根据菜品 id 查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        // 将查询到的数据封装到 VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    // 根据 id 修改菜品基本信息和对应的口味信息
    public void updateWithFlavor(DishDTO dishDTO) {
        // 修改菜品基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        // 删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        // 重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            // 向口味表插入 n 条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    // 分类 ID 查询相关菜品
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    // 菜品的起售停售
    public void updateStatus(Integer status, Long id) {
        if (Objects.equals(status, StatusConstant.DISABLE)) {
            List<Setmeal> setmealList = dishMapper.getSetmealList(id);
            if (setmealList != null && !setmealList.isEmpty()) {
                setmealList.forEach(setmeal -> {
                    if (Objects.equals(setmeal.getStatus(), StatusConstant.ENABLE)) {
                        throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ENABLE_STATUS);
                    }
                });
            }
        }

        Dish dish = dishMapper.getById(id);
        dish.setStatus(status);
        dishMapper.update(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
